US10355906B2 - Synchronization device and synchronization method - Google Patents
Synchronization device and synchronization method Download PDFInfo
- Publication number
- US10355906B2 US10355906B2 US16/052,753 US201816052753A US10355906B2 US 10355906 B2 US10355906 B2 US 10355906B2 US 201816052753 A US201816052753 A US 201816052753A US 10355906 B2 US10355906 B2 US 10355906B2
- Authority
- US
- United States
- Prior art keywords
- signal
- generation
- operator
- vector
- expression
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2657—Carrier synchronisation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2657—Carrier synchronisation
- H04L27/2659—Coarse or integer frequency offset determination and synchronisation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2628—Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2646—Arrangements specific to the transmitter only using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2649—Demodulators
- H04L27/265—Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2662—Symbol synchronisation
- H04L27/2663—Coarse synchronisation, e.g. by correlation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2662—Symbol synchronisation
- H04L27/2665—Fine synchronisation, e.g. by positioning the FFT window
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2668—Details of algorithms
- H04L27/2669—Details of algorithms characterised by the domain of operation
- H04L27/2671—Time domain
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2668—Details of algorithms
- H04L27/2673—Details of algorithms characterised by synchronisation parameters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/04—Speed or phase control by synchronisation signals
- H04L7/041—Speed or phase control by synchronisation signals using special codes as synchronising signal
- H04L7/042—Detectors therefor, e.g. correlators, state machines
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/04—Speed or phase control by synchronisation signals
- H04L7/06—Speed or phase control by synchronisation signals the synchronisation signals differing from the information signals in amplitude, polarity or frequency or length
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2668—Details of algorithms
- H04L27/2669—Details of algorithms characterised by the domain of operation
- H04L27/2672—Frequency domain
Definitions
- the present invention relates to a synchronization device and a synchronization method for multicarrier signals using a synchronization processing technology for a modulated or demodulated signal of a wireless access physical layer in a 5G wireless communication radio access technology (RAT).
- RAT radio access technology
- wireless interfaces for high speed, broadband, and low latency in wireless bandwidths are requested and measurement test devices for new interfaces are also requested.
- standard examination of a wireless scheme is in progress to achieve effective use of new transmission efficiency by suppressing leakage of signals outside of a channel bandwidth of a CP-OFDM signal operated in the existent standard 4G or the like and so that bandwidth rates can coexist for each level of a subcarrier group.
- FBMC FBMC
- UF-OFDM UF-OFDM
- GFDM GFDM schemes
- time multiplexing is used for a channel together in an individual channel in units of channel groups, and examination of a scheme of executing filtering in a channel multiplexed group or a scheme of executing a windowing process on a CP-OFDM signal and additionally executing new temporal smoothness is in progress.
- the invention is devised in view of the foregoing problems and an object of the invention is to provide a synchronization device and a synchronization method capable of handling synchronization of various communication schemes.
- a synchronization device includes a signal generation unit 2 that sets the number of subcarriers, information regarding a synchronization code, a signal generation operator, and an order of calculation necessary to generate a predetermined type of multicarrier signal and generates a multicarrier signal in which the synchronization code is embedded in a symbol in accordance with the number of subcarriers, as an internally transmitted signal, based on the calculation of the signal generation operator, the number of subcarriers, and the information regarding the synchronization code in the order; a signal reception unit 3 that receives the same type of multicarrier signal as the internally transmitted signal as an externally received signal from outside and samples the externally received signal at each sampling interval; a time sequence data conversion unit 4 that samples the internally transmitted signal generated by the signal generation unit at each sampling interval and outputs sampled data of the internally transmitted signal shifted at the sampling interval; a correlation processing unit 5 that executes correlation calculation between the sampled data of the internally transmitted signal and sampled data of the externally
- the signal generation unit may include a scenario composing unit ( 11 ) that acquires the type of multicarrier signal and the number of subcarriers and sets signal generation operators an order of calculation necessary to generate the type of multicarrier signal, and an execution unit ( 12 ) that acquires the number of input signals in accordance with the number of subcarriers and generate the multicarrier signal from the input signals by calculating the signal generation operators in the order.
- the signal generation operators may be operators (A k , B k ) granting time characteristics, frequency characteristic, or through/zero characteristics specified with a suffix k indicating the order, and the operator B k may be further a mapping conversion operator of an input signal vector U.
- the predetermined multicarrier signal may be generated by repeatedly operating the operators (A k , B k ) by a recurrence formula of Expression (1) below in accordance with the suffix k.
- X k A k X k ⁇ 1 +B k U Expression (1)
- the scenario composing unit ( 11 ) may acquire characteristics to be added to the multicarrier signal and set characteristic addition operators and an order of calculation necessary to add the characteristics.
- the execution unit may add the characteristics to the generated multicarrier signal by calculating the characteristic addition operators in the order.
- the characteristic addition operators may be operators (C k , D k ) granting characteristics necessary for transmission path distortion, signal evaluation, and device evaluation such as through and zero to the generation course signal, and the operator D k may be an operator of disturbance noise V.
- An evaluation multicarrier signal to which the predetermined characteristics are granted may be generated by repeatedly applying the operators (C k , D k ) by a recurrence formula of Expression (2) below in accordance with the suffix k.
- Y C k X k +D k V Expression (2)
- the state variable X k may be divided into a plurality of vectors Xd 1k and Xd 2k .
- the first and second generation course signals may be generation course signals on a frequency axis or a time axis
- a signal may be generated by applying Expression (1) above to the generation course signal X k _ New1 or the generation course signal X k _ New2.
- a multicarrier signal may be generated by further applying Expression (2) to the signal generated by applying Expression (1) above to the generation course signal X k _ New1 or the generation course signal X k _ New2.
- the scenario composing unit may set the signal generation operators and the order of the calculation by combining the operators in accordance with presence or absence of the CP for synchronization, presence or absence of the filtering process, or presence or absence of the windowing process.
- the correction control unit 10 may execute calculation of Expressions (1) and (2) above and update the state vector by Expression (3) below using a correction operator Op (F C ) generated from the correction amount at a front stage at which inverse fast Fourier transform or inverse discrete time Fourier transform is executed.
- F C correction operator
- the time sequence data conversion unit 4 may generate time sequence data of a sample point at a time of Ts+m ⁇ T (where m is an integer) at which Ts is a reference when Ts is the sampling interval.
- a synchronization method includes: a step of setting the number of subcarriers, information regarding a synchronization code, a signal generation operator, and an order of calculation necessary to generate a predetermined type of multicarrier signal and generating a multicarrier signal in which the synchronization code is embedded in a symbol in accordance with the number of subcarriers, as an internally transmitted signal, based on the calculation of the signal generation operator, the number of subcarriers, and the information regarding the synchronization code in the order; a step of receiving the same type of multicarrier signal as the internally transmitted signal as an externally received signal from outside and sampling the externally received signal at each sampling interval; a step of sampling the internally transmitted signal at each sampling interval and outputting sampled data of the internally transmitted signal shifted at the predetermined sampling interval; a step of executing correlation calculation between the sampled data of the internally transmitted signal and sampled data of the externally received signal; a step of detecting a position at which a correlation value in the correlation calculation is maximum as an
- the synchronization method according to claim 11 may further include a step of executing calculation of Expressions (4) and (5) above when X k is a state vector indicating a state variable of each subcarrier as a vector, Y is an output vector, A k , B k , C k , and D k are operators used for the state variable, U is an input vector indicating an input signal of each subcarrier as a vector; and a step of updating the state vector by Expression (6) below using a correction operator Op (F C ) generated from the correction amount at a front stage at which inverse fast Fourier transform or inverse discrete time Fourier transform is executed.
- F C correction operator
- the synchronization method according to claim 11 or 12 may further include a step of generating time sequence data of a sample point at a time of Ts+m ⁇ T (where m is an integer) at which Ts is a reference when Ts is the sampling interval.
- the aspect of the invention it is possible to acquire the synchronization circuit and the synchronization method that are flexible and efficient by extracting an influence of distortion of an external communication environment as a control amount, converting the control amount at that time into a state amount with a state space expression format, and executing direct access for feedback.
- FIG. 1 is a block diagram illustrating an overall configuration of a synchronization device according to the invention.
- FIG. 2 is a schematic diagram illustrating a configuration of an example of a signal generation unit contained in the synchronization device according to the invention.
- FIG. 3 is a diagram illustrating an example of a multicarrier signal.
- FIG. 4 is a diagram illustrating an example of an allocation order.
- FIG. 5 is a diagram illustrating an example of an input vector.
- FIG. 6 is a diagram illustrating examples of a state variable and impulse responses.
- FIG. 7 is a schematic diagram illustrating channel multiplexing by division in one symbol.
- FIG. 8 is a diagram illustrating an example of a classification table of multicarrier signals.
- the invention relates to a synchronization circuit that contains signal generation models generating various modulation waves with regard to various OFDM-based modulation schemes expected in 5G and a scheme of setting the signal generation models as plants and achieving synchronization using two control mechanisms in accordance with actual externally received signals, and is based on the idea that control laws are used as externally received signals.
- a main object of the invention is to provide a general-purpose reception side synchronization scheme by unifying techniques expected to be used in new radio (NR) and using a general-purpose signal generation model in accordance with a scheme configured in a software defined radio (SDR) manner as a modulation scheme.
- NR new radio
- SDR software defined radio
- a signal generation unit that uses a state space description technology capable of configuring software defined radio (SDR) is adopted to a signal generation model to achieve the foregoing objects and handle synchronization of various communication schemes.
- SDR software defined radio
- a policy on synchronization is to generate a signal equivalent to an externally received signal in addition to control on the signal generation unit which is a control target using the signal generation unit as a plant and using an externally received signal as a control law.
- a detected control amount is a correction amount of the externally received signal for synchronization.
- an OFDM-based synchronization is a stream signal formed by a signal sequence, it is important to detect an appropriate position of a symbol.
- CP-OFDM there is a structure for recovering synchronization by CP (transmission efficiency deteriorates while a processing time is shortened). However, even when there is no CP, it is important to achieve synchronization.
- Synchronization of an OFDM-based signal is achieved by correcting STO and CFO.
- Carrier frequency offset is obtained by observing a phase state of a subcarrier and control within 1 Ts is necessary for the CFO.
- the CFO can be executed through FFT-based demodulation and is obtained through phase rotation of complex number output of FFT.
- a CAZAC sequence code which is also used in 3GPP 4G, has strong autocorrelation, and is very excellent in a synchronization correlation process is used as a synchronization code.
- a synchronization scheme preparation of a reception function of responding to a variation in an environment caused due to the communication environment and the transmission waveform is a considerably trustworthy policy. Accordingly, in the synchronization scheme of the invention, when the signal generation unit is prepared as a signal generation model and words of control are used, a format for executing feedforward control on the STO and feedback control on the CFO setting the signal generation unit as a control target is adopted. Since the STO can be configured such that a CFO control amount is fed back to a state variable by executing optimum value searching through correlator calculation, a form in which the signal generation model is contained is a considerable uniform technique.
- modulated waves proposed in OFDM-based NR can be classified in a unified manner.
- the unified expression means that a universal configuration can be realized as in the SDR.
- modulation such as UF-OFDM, FBMC, CP-OFDM, and W-OFDM can be classified and expressed in a time sequence k and a combination of system matrixes (A, B, C, and D) at k.
- This has a processing format of Op*X k by inserting an operator Op (any of A k , B k , C k , and D k ) into the state variable X k .
- a code sequence to be transmitted is mapped in conformity with a designated modulation scheme.
- a set of (I, Q) signals in 2-dimensional space can be formed according to a modulation scheme (QPSK, QAM, or the like) determined in advance.
- QPSK quadrature phase-shift keying
- QAM quadrature amplitude modulation
- a time sequence is transmitted.
- a subcarrier interval and disposition of the number of subcarriers can be determined.
- a physical time interval is given at the time of transmitting a signal, a physical frequency of the subcarrier is naturally determined.
- a synchronization device 1 schematically includes a signal generation unit 2 , a signal reception unit 3 , a time sequence data conversion unit 4 , a correlation processing unit 5 , an STO timing detection unit 6 , a first FFT unit 7 , a second FFT unit 8 , a difference calculation unit 9 , and a correction control unit 10 .
- a configuration of each unit will be described.
- FIG. 2 illustrates an example of the signal generation unit 2 according to the embodiment.
- the signal generation unit 2 generates a multicarrier signal in which a synchronization code (a complex number sequence with strong autocorrelation) of the CAZAC sequence is embedded in a predetermined symbol by the same kind of signal as an externally received signal to be described below, includes a CPU that functions as an execution unit 12 , and outputs an output signal y formed by a multicarrier signal with respect to an input signal u formed by a code sequence.
- the signal generation unit 2 includes a memory 13 that stores a state variable or a calculation matrix.
- the signal generation unit 2 includes an input and output unit 16 and a communication IF 17 that executes remote adjustment.
- the input and output unit 16 inputs the input signal u and outputs the output signal y. Each configuration is connected via a data connection bus and a control bus.
- the input and output unit 16 may have not only a function of inputting and outputting data but also a function of complying with an interface unique to an RF modulation unit, such as a data format, a code, or a sequence.
- a signal type of a multicarrier signal is input to the input and output unit 16 .
- the signal type has the same type of externally received signal to be described below.
- UF-OFDM, CP-OFDM, FBMC, filter OFDM, GFDM, and Windowing-OFDM can be exemplified.
- Any piece of information necessary to generate a multicarrier signal, such as presence or absence of a synchronization signal, the number of subcarriers, a modulation scheme, and a filtering scheme in accordance with the externally received signal to be described below is input to the input and output unit 16 .
- the CPU included in the signal generation unit 2 further functions as a scenario composing unit 11 .
- the scenario composing unit 11 composes a scenario at the time of generating a multicarrier signal and controls the execution unit 12 according to the scenario.
- the execution unit 12 executes arithmetic processing using an operator set by the scenario composing unit 11 .
- the mapper input conversion unit 14 has a function of converting each element of the input signal u formed from a desired code sequence into a pair of (I, Q) signals corresponding to a predetermined modulation scheme.
- the input signal u has a portion providing amplitude phase information to be converted into amplitude phase information of a sinusoidal wave (hereinafter referred to as primary modulation).
- the primary modulation may be a digital signal 1/0 or may not be a signal with a large bandwidth in a rectangular shape such as a 1/0 information.
- an occupied bandwidth of the signal can be reduced.
- mapping points of 8*8 are generated.
- IFFT inverse fast Fourier transform
- the multicarrier signal can be expressed with a matrix in which a frequency is set as a dimension. Accordingly, the input signal u is allocated for each subcarrier, and the input vector U and the output vector Y in which the input signal u and the output signal y are expressed as vectors are shown in Expression (7) below.
- N the number of subcarriers N is mainly 4 will be described to facilitate understanding.
- the input vector U is any code sequence formed by 1/0.
- the scenario composing unit 11 uses the input vector U according to the generated multicarrier signal.
- FIG. 3 illustrates an example of the multicarrier signal.
- the signal generation unit 2 can generate any multicarrier signal to be used in a filtered multicarrier communication scheme for each symbol.
- the generated multicarrier signal may be a preamble signal S pab , may be a control signal, or may be a payload signal.
- the payload signal may include a pilot signal S plt .
- the input vector U according to the generated multicarrier signal may be generated using a numerical conversion operator.
- a k is an operator indicating a calculation process to be executed on the state vector X.
- the operators A k and B k function as signal generation operators necessary to generate the multicarrier signal.
- the signal generation operators are the operators A k and B k granting time characteristics, frequency characteristics, or through/zero characteristics specified with a suffix k indicating an order.
- the operator B k may be a mapping conversion operator of the input signal vector U.
- Expression (8) is a state space expression formula at each time point specified with the suffix k.
- C k in Expression (9) is an operator indicating a calculation process to be executed on the state vector
- V is a disturbance vector indicating a disturbance v of each subcarrier
- D k is an operator indicating a calculation process to be executed on the disturbance vector.
- the operators C k and D k function as characteristic addition operation necessary to grant characteristics to the multicarrier signal.
- the characteristic addition operators are the operators C k and D k granting characteristics necessary for transmission path distortion, or signal evaluation, or device evaluation such as through and zero to the generation course signal X k .
- the operator C k is a unit matrix (hereinafter denoted by ⁇ E ⁇ or E) and D k N is ⁇ 0 ⁇ .
- M M an operator mapping the input signal u to symbol points in conformity with a modulation scheme
- M T an operator executing symbol multiplexing on the time axis.
- any modulation scheme can be used.
- 16Quadrature Amplitude Modulation QAM
- QAM 16Quadrature Amplitude Modulation
- I and Q components are separately exemplified on the assumption of a result after the input signal u is converted.
- each procedural calculation is executed.
- the input vector U is expressed as in Expression (10) below, for example.
- the right side of Expression (10) can be converted as in Expression (11).
- the operator M M is expressed in Expression (12), for example.
- b ij is a table illustrated in FIG. 5 .
- the parenthesis in the drawing indicates a (I, Q) component.
- a target modulation scheme is BPSK, QPSK, Mary-QAM, or Offset QAM.
- the operator M T is expressed in Expression (14), for example.
- T iFFT an operator executing an inverse fast Fourier transform
- T iDFT an operator executing an inverse discrete time Fourier transform
- T FFT an operator executing fast Fourier transform
- T DFT is an operator executing discrete time Fourier transform.
- N is a total number of conversion elements and n and k are interpreted as variables corresponding to a time sequence and a frequency sequence, respectively.
- the discrete sampling time is normalized to 1.
- the operator T FFT is expressed in Expression (17) below, for example.
- w is a twiddle factor.
- T iDFT executing the inverse discrete time Fourier transform is expressed in Expression (18) below.
- the operator T FFT can be used with a relation with of an inverse matrix T iFFT ⁇ 1 of T iFFT and the operator T iDFT can be used with a relation with of an inverse matrix T DFT ⁇ 1 of T DFT .
- F U an operator executing a filtering process in a frequency domain for each subcarrier
- F P an operator executing a filtering process on a time sequence format signal of a plurality of subcarriers
- F PR an operator executing a cyclic convolution filtering process
- F PPN an operator executing a filtering process with a poly-phase format on a plurality of subcarriers
- F DET an operator executing a process of changing an output timing for each piece of filtering data and aligning the output timing in a time transmission direction;
- F C is an operator executing frequency characteristic correction of filtering.
- F ⁇ is a coefficient operator necessary for preprocessing and is a coefficient complex multiplication arriving at the front stage of iFFT.
- F ⁇ has an equivalent configuration to F C .
- ⁇ is a suffix of F.
- the operator F U is a filtering operator in the frequency domain and is expressed in Expression (19) below, for example.
- f U is a complex number and frequency phase characteristics of the subcarrier are granted and filtering is executed.
- f U indicates a frequency response of a filter.
- m 0, 1, 2, . . . , M ⁇ 1
- the operator F PR executing cyclic convolution on the filtering in the time domain is expressed in Expression (23), for example.
- g(i) is an impulse response of the filter
- the operator F PPN has a role of a poly-phase filter for time sequence data in Expression (24) below.
- pp i (Z M ) is an operator formed by delay operators and is configured as in Expression (25) below.
- z ⁇ M in x k ⁇ 1 is a delay operator and indicates that data after M timing is used. [Math. 25] pp i ( Z M ) g ( i )+ g ( i+M ) z ⁇ M g +( i+ 2 M ) z ⁇ 2M +g ( i+ 3 M ) z ⁇ M Expression (25)
- the operator FDET is expressed in Expression (27) below, for example.
- z ⁇ 1 is a delayer operator. Data is aligned in a time sequence in the delay unit.
- the operator F C is an operator for frequency amplitude phase correction through a filtering process and is expressed in Expression (28) below, for example.
- fc is a complex number indicating inverse characteristics of a filter for each subcarrier.
- the operator F ⁇ is expressed in Expression (29) below, for example.
- the operator F ⁇ is used when an adjustment coefficient is multiplied for each subcarrier as preprocessing.
- ⁇ is a complex number.
- S CP an operator executing addition of a cyclic prefix (CP) for synchronization and is executed after filtering;
- S win an operator executing a windowing process on data.
- the operator S CP is expressed in Expression (30) and (31), for example, when the number of CPs is 2.
- S CFO is an operator that executes addition of a carrier frequency offset (CFO).
- S T is expressed in Expression (32) below, for example.
- st is a complex number indicating distortion of a transmission path.
- S T can be applied to either a time sequence or a frequency sequence.
- S CFO is expressed in Expression (33) below, for example.
- cfo is a complex number indicating frequency shift.
- S CFO can be applied to either a time sequence or a frequency sequence.
- the operator S N is expressed in Expression (34) below, for example. This assumes a model in which an independent noise sequence v is superimposed by granting amplitude phase characteristics at sn for each subcarrier. S N can be applied to either a time sequence or a frequency sequence.
- the signal generation unit 2 can flexibly change presence or absence of a synchronization signal, a kind of signal, the number of subcarriers, a modulation scheme, and a filtering scheme by combining the operators A k , B k , C k , and D k . Therefore, the signal generation unit 2 can generate various multicarrier signals with a simple configuration.
- the scenario composing unit 11 sets an order of calculation and the operators A k and B k .
- a modulation scheme of the operator M M is the 16QAM modulation scheme.
- the state vector X 2 is a vector signal sequence which is the multicarriers.
- Amplitude phase distortion of a filter by the operator F P is corrected in some cases.
- the operator F C is executed as the operator A 2 .
- the state vectors X 2 to X 4 are as follows.
- F P *T iFFT *E (where E is a unit matrix) is generated and a frequency distortion value of each subcarrier can be calculated by T FFT (F P *T iDFT *E).
- a UF-OFDM signal or a CP-OFDM signal can be generated by combining the operations in the order set in the scenario composing unit 11 .
- a signal in conformity with a scheme disclosed in non-patent documents such as CP-OFDM, Generalized Frequency Division Multiplexing (GFDM), and Filter Bank MultiCarrier (FBMC) can be generated using the following operators.
- the signal generation unit 2 can construct the multicarrier signal of each scheme using a combination of the operators.
- the scenario composing unit 11 further sets the operators C k and D k and an order of calculation in addition to the operators A k and B k .
- the CPU included in the signal generation unit 2 further functions as an evaluation unit 15 .
- the evaluation unit 15 evaluates a multicarrier signal.
- the scenario composing unit 11 sets an operator G which is a signal analysis operator used to evaluate the multicarrier signal and an order of calculation.
- the scenario composing unit 11 inputs the multicarrier signal as a reception vector R to the evaluation unit 15 . At this time, the scenario composing unit 11 sets the operator T FFT to convert the multicarrier signal into a sequence signal in a frequency domain.
- the scenario composing unit 11 designates the operator G in the evaluation unit 15 .
- the evaluation unit 15 calculates G*(T FFT *R).
- G CCDF an operator executing a complementary cumulative distribution function (CCDF) process.
- CCDF complementary cumulative distribution function
- PAPR peak to average power ratio
- G CS an operator executing a constellation process.
- the constellation process includes an average, dispersion, an error vector magnitude (EVM) for each subcarrier.
- EVM error vector magnitude
- the constellation process can also be applied for each constellation (a signal point of a signal space diagram).
- F CDF vector representation of f CCDF of each carrier
- G CCDF is expressed in Expression (35) below, for example.
- j of the f CCDF operator indicates an amplitude probability distribution with a level up to j.
- f CCDF conforms as follows.
- z is a time advance operator
- k is the number of pieces of data
- j is an index of an amplitude level
- Lj is an amplitude level.
- the operator G CS is expressed in Expression (37) below, for example.
- the subscript k assumes that the reception vector arrives at a time sequence.
- I k and Q k indicate reference values determined in advance.
- L is obtained.
- a pseudo-inverse matrix can also be calculated and obtained.
- the calculation can be executed for each symbol.
- the invention can also be applied to a plurality of symbols. In this case, it is possible to realize the application by increasing a state variable matrix in a column direction.
- a vector of the state variable X k is a state in which a code sequence is mapped to complex numbers.
- the vector is normally disposed on a frequency axis.
- a state variable X k is divided into two pieces, Xd 1k and Xd 2k .
- the operators A k and B k are applied to A 11 , B 11 , . . . of FIG. 7 according to a generation method or the like of each scheme described in the first embodiment.
- the signals Xd 1k and Xd 2k of OFDM_1 and OFDM_2 are formed for each channel and are subsequently connected (added) to generate X k _ New2 on the time axis.
- channel-multiplexed signals with different modulation mapping scheme content can be generated by operators A k _ New2 and B k _ New2 for forming CP addition by which distortion of a transmission path can be corrected. The same applies to a case of multiplexing of two channels with different subcarrier intervals.
- the time axes or the frequency axes of the different schemes are aligned and then connected. For example, since outputs of the generation course signals of CP-OFDM and UF-OFDM are on the time axis, the outputs are connected (summed) along a route of X k _ New2.
- the outputs may be connected even on the time axis along a route of X k _ New1 via A 1x , B 1K , A 2K , and B 2K operators changing from the time axis to the frequency axis.
- generation course signals may be generated on each frequency axis and Xd 1k and Xd 2k may be connected on the frequency axis along the route of X k _ New1.
- a time sequence signal on the time axis is used. Therefore, when the foregoing X k _ New1 and X k _ New2 are input, operators A k _ New2 and B k _ New2 cause generation course signals to generate a signal as a time sequence signal.
- a scenario includes any task which can be executed by the signal generation unit 2 .
- the task is, for example, signal generation, signal analysis, feedback, or a communication IF.
- kinds of signals to be processed in the task are, for example, OFDM, CP-OFDM, UF-OFDM, FBMC, GFDM, Filtered OFDM, and Windowing-OFDM.
- the scenario composing unit 11 binds information necessary for a scenario to each other by a sequencer with reference to a database in which the information is stored.
- the scenario composing unit 11 converts the bound information into a format which can be executed by the execution unit 12 .
- a command completed in this way is executed by the sequencer.
- the database which is referred to by the scenario composing unit 11 stores kinds of multicarrier signals, a code sequence of an input signal, a synchronization code (a pilot pattern and a preamble), the number of subcarriers, the number of symbols, a modulation scheme, a time transmission interval (TTI), and the like.
- the database may be hierarchically configured in an order of a procedure, the kinds of multicarrier signals, attributes of the multicarrier signals, a code sequence, or the like.
- the scenario composing unit 11 may control the execution unit 12 in response to a command from the communication IF 17 .
- the scenario composing unit 11 adds and updates the information stored in the database in response to a command input from the communication IF 17 .
- a remote operation can preferably be executed from the outside in a regular command language.
- the remote operation from the outside is, for example, scenario activation, scenario updating, or parameter updating (code sequence).
- the scenario composing unit 11 executes a setting order, a design order, and an execution order to execute a signal generation task.
- the signal generation unit 2 acquires information necessary to generate a multicarrier signal.
- the information necessary to generate the multicarrier signal is, for example, a kind of signal, a code sequence, a synchronization code, the number of subcarriers, the number of symbols, a modulation scheme of executing modulation, a time transmission interval (TTI), an application filter type, presence or absence of filter correction, presence or absence of a CP, the number of CPs.
- TTI time transmission interval
- Any information acquisition method can be used.
- Information may be acquired from the input and output unit 16 of the signal generation unit 2 , may be acquired from the communication IF 17 , or may be read from a database.
- the scenario composing unit 11 sets operators used to calculate the state vector X and an order of the operators according to an input in the setting order. At this time, the scenario composing unit 11 also sets a parameter used to calculate the operators.
- an operation is executed using an execution permission flag with a time-varying system.
- a time-varying system it is possible to generate the multicarrier signal of a desired kind of signal, a desired code sequence, a desired synchronization code, the desired number of subcarriers, the desired number of symbols, a desired modulation scheme, and a desired TTI.
- the scenario composing unit 11 executes a setting order, a design order, and an execution order to execute a signal analysis task.
- analysis content is set.
- the analysis content is, for example, a CCDF process or a constellation process.
- the scenario composing unit 11 reads operators and parameters used until the time of derivation of the output vector Y as operators and parameters used to receive the multicarrier signal from the memory 13 .
- operators and parameters are set according to an input in the setting order in the evaluation unit 15 .
- the scenario composing unit 11 sets the operator G CS .
- the signal generation unit 2 may read the operators and the parameters used to generate the multicarrier signal from the memory 13 . For example, when the operator T iFFT is used until derivation of the output vector Y, the scenario composing unit 11 sets the operator T FFT .
- the evaluation unit 15 causes a time-varying system to execute an operation using an execution permission flag.
- the signal generation task is executed again.
- the scenario composing unit 11 updates the parameters of the scenario.
- the signal generation unit 2 can generate a desired signal by repeating a simple matrix structure. Further, the signal generation unit 2 can evaluate the signal and performs feedback of an evaluation result, and thus various parameters can be evaluated by one device. Further, the signal generation unit 2 can flexibly take countermeasures in response to an instruction from a remote site.
- the signal reception unit 3 receives the same kind of multicarrier signal as that of the signal generation unit 2 in which a synchronization code of a CAZAC sequence is embedded in a predetermined symbol from the outside.
- the multicarrier signal from the outside normally includes, for example, disturbance such as transmission loss, noise, or a defect of an external transmitter.
- the signal reception unit 3 samples a multicarrier signal containing the disturbance as an externally received signal at a predetermined sampling interval Ts.
- the sampled data is stored as a matrix with the number of rows of a frame length and the preset number of columns in the correlation processing unit 5 .
- the signal reception unit 3 outputs the sampled data sampled at each sampling interval Ts to the first FFT unit 7 .
- the signal reception unit 3 may have a configuration including a function of executing a filtering process on the externally received signal in conformity with AGC level adjustment or a transmission scheme.
- the signal reception unit 3 may have a configuration in which an A/D converter is included.
- the time sequence data conversion unit 4 samples the internally transmitted signal generated in the signal generation unit 2 at each sampling interval Ts and outputs the sampled data of the internally transmitted signal shifted at the sampling interval Ts.
- the sampled data is stored as a matrix with the number of rows of a frame length and the preset number of columns in the correlation processing unit 5 .
- the time sequence data conversion unit 4 outputs the sampled data sampled at each sampling interval Ts to the second FFT unit 8 .
- the correlation processing unit 5 executes cross-correlation calculation of a complex number between sampled data (Ex 1 , Ex 2 , . . . , Ex n ) of the externally received signal and sampled data (Ip 1 , Ip 2 , . . . , Ip n ) of the internally transmitted signal processed by the time sequence data conversion unit 4 in, for example, Expression (40) below.
- the cross-correlation calculation may be executed by Expression (41) below normalized with each piece of correlation data.
- * indicates a complex conjugate calculation and
- is absolute value calculation.
- the STO timing detection unit 6 sets a signal sequence in which a maximum correlation value is obtained as a result of the correlation calculation by the correlation processing unit 5 as an STO signal sequence in which an STO timing is determined and detects an STO timing at a position at which a frame is extracted at this time.
- the first FFT unit 7 demodulates on the sampled data of the externally received signal input at each sampling interval Ts from the signal reception unit 3 through fast Fourier transform and extracts an amplitude phase component of the externally received signal (a complex signal sequence).
- the second FFT unit 8 demodulates on the sampled data of the internally transmitted signal input at each sampling interval Ts from the time sequence data conversion unit 4 through fast Fourier transform and extracts an amplitude phase component of each subcarrier in the internally received signal (a complex signal sequence).
- the difference calculation unit 9 compares the amplitude phase component of each subcarrier of the externally received signal extracted by the first FFT unit 7 to the amplitude phase component of each subcarrier of the internally transmitted signal extracted by the second FFT unit 8 and calculates a difference between the amplitude phase components of each subcarrier.
- the correction control unit 10 performs correction control on the signal generation unit 2 in accordance with a synchronization method to be described below such that a difference in the amplitude phase component of each subcarrier in a state in which the STO timing calculated in the difference calculation unit 9 is detected is added as a correction amount to the internally transmitted signal newly generated by the signal generation unit 2 .
- the correction amount may be only a difference in the phase component.
- Communication specifications (in view of only transmission and the others are omitted) which are assumption of transmission and reception of the signal are assumed to be determined in advance before start of communication.
- the communication specifications mentioned here is, for example, the sampling interval Ts, a symbol length, the number of subcarriers, TTI, a frame format, a position and a sequence length (preamble length) of a synchronization code, a temporary modulation format, and a transmission scheme: a waveform scheme.
- the signal generation unit 2 is set in conformity with the transmission scheme of the communication specification.
- a sequence with the preamble length determined in advance is embedded in a symbol.
- the signal generation unit 2 generates a multicarrier signal as an internally transmitted signal in the order of the classification table of FIG. 8 in conformity with the transmission scheme of the communication specification.
- the internally transmitted signal generated by the signal generation unit 2 is sampled at the predetermined sampling interval Ts in the time sequence data conversion unit 4 .
- the sampled data of the internally transmitted signal is stored as a matrix with the number of rows of the frame length and the preset number of columns in the correlation processing unit 5 .
- the externally received signal is sampled at the predetermined sampling interval Ts in the signal reception unit 3 .
- the sampled data of the externally received signal is stored as the matrix with the number of rows of the frame length and the preset number of columns in the correlation processing unit 5 , like the internally transmitted signal.
- the correlation processing unit 5 performs matrix calculation on the matrix of the sampled data of the externally received signal and the matrix of the sampled data of the internally transmitted signal in conformity with Expression (42) below and performs a correlation process at the level of the sampling interval Ts.
- the correlation process at the level of the sampling interval Ts correlation calculation of frames of the internally transmitted signal and the externally received signal in which an arrival input preamble data sequence In is arranged in frames of predetermined symbol units in advance is performed to obtain a correlation value.
- the CAZAC sequence code the complex number sequence with strong autocorrelation is used as a synchronization code
- a time sequence frame in a case of the highest correlation value of the autocorrelation is a likelihood symbol frame.
- X ki is a row vector of the internally transmitted signal and In ki is an input vector of the externally received signal.
- Expression (42) above expresses a complex correlation process and indicates STO with an optimum position at which a correlation value Cor is maximum.
- Ip ki is a row vector of the internally transmitted signal and Ex ki is an input vector of the externally received signal.
- Ip ki indicates a case in which a signal sequence delayed by a timing of one sample time is prepared in advance.
- Ex ki indicates a signal sequence. * means complex conjugate calculation. In this calculation, Ip and Ex may be mutually permutated.
- the STO timing detection unit 6 detects an input sequence in which the maximum correlation value is determined as an STO signal sequence of the STO timing as a result of the correlation process by the correlation processing unit 5 and determines an extraction position of a frame at this time.
- an output sequence of a transmission unit by the internally transmitted signal and the STO signal sequence are demodulated on the FFT base to take a difference of each subcarrier No.
- demodulation may be executed in this state. That is, when an EVM value after the demodulation is within a regular range, communication is determined to be possible.
- the transmission unit of the multicarrier signal can classify the schemes in the transmission scheme state space expression, as illustrated in FIG. 8 .
- i of Ai and Bi indicates a timing of a time sequence.
- the state transitions sequentially from the left to the right, transmission data is transmitted, and the series of operations is repeated in consideration of a transmission timing.
- the transmission scheme is CP-OFDM
- the state transitions in the order of (0, M M ) ⁇ (T iFFT , 0) (S CP , 0) and the transmission data is transmitted.
- the transmission scheme is GFDM
- the classification table of FIG. 8 also shows a series of operations of a transmission waveform.
- a unit of a data sequence of the multicarrier signal is a symbol.
- a complex value can be obtained for each subcarrier No of the symbol and a pair of amplitude and phase of the complex number can be obtained.
- a numerical value of a difference between the signal sequence of the externally received signal and the signal sequence of the internally transmitted signal is 0, when the two signal sequences are matched. However, when there is an error, the error appears as a residual of the complex number. Since the difference is a residual of the FFT base, the difference is an event of the frequency domain and a correction operator of Op (F C ) is generated with the numerical value of the residual. This is a numerical matrix called a control amount.
- an amount to be secondly corrected is a cumulative value of ⁇ 1 and ⁇ 2.
- the synchronization process on the multicarrier signal ends.
- the STO timing and the CFO correction amount (including the amplitude correction amount) can be extracted after this process. Therefore, by applying the extracted STO timing and CFO correction amount to an actual symbol, it is possible to execute demodulation in which synchronization can be achieved after an extraneous influence is eliminated.
- TTI transmission time interval
- the externally received signal of one symbol is acquired by sampling the sampling interval Ts, correlation calculation with the internally transmitted signal which is a model signal is executed, and a frame at a position at which the maximum correlation value is acquired is detected as an STO timing.
- frame detection is substantially determined.
- the correction operator Op (F C ) using a difference between in the amplitude phase component (or a phase component) between the complex signal obtained by executing fast Fourier transform on the externally received signal and the internally transmitted signal as the correction amount is generated, the state variable in the frequency domain of the state space is multiplied by Op (F C ), and a new state variable at a subsequent stage is generated.
- the signal generation unit is configured in the state space expression to correspond to synchronization of various communication schemes generated in future and the various schemes can be changed in the SDR.
- the extent of an external environment can be extracted as a control amount through feedforward control and feedback control using an external signal as a control law. Since the control amount at that time can be directly accessed to a state amount in the state space expression format, a flexible and efficient synchronization circuit and synchronization method can be obtained.
- control amount can be acquired as a numerical value and can be embedded in the state space state variable
- a mathematical model of a communication environment can be acquired.
- a new signal generation model including an environment can be provided. This nature can also be effectively utilized in a test measurement instrument for signal generation in addition to recovery of actual synchronization.
- the time sequence data conversion unit 4 performs a process of shifting the sampled data of the internally transmitted signal by the sampling interval Ts, and the correlation processing unit 5 executes the correlation process at the level of the sampling interval Ts through a time sequence data conversion process (a rough conversion process) in a sampling time unit.
- the time sequence data conversion unit 4 can also execute a time sequence data conversion process within a time of the sampling interval Ts, that is, a time sequence data conversion process (a fine conversion process) within the sampling time unit.
- a time sequence data conversion process a fine conversion process
- calculation similar to the rough conversion process can be executed using Expression (43).
- the conversion process can also be executed on the externally received signal in the signal reception unit 3 .
- the time sequence data conversion unit 4 or the signal generation unit 2 can also execute delay time adjustment based on the arrival time delay value.
- the fine conversion process is a process of calculating a value at any position between adjacent sampling points of time sequence data and which is generated at an equal time similarly to the sampling interval. That is, time sequence data at a sampling point at the time of Ts+m ⁇ T (where m is an integer) is generated using the sampling interval Ts as a reference.
- the time sequence data can be expressed in advance as a matrix of convolution calculation of the input signal and a conversion coefficient group in which assumed positions are used as coefficients.
- a change in m ⁇ T causes a conversion coefficient to be timely changed.
- the conversion coefficient group is a type of Toeplitz Matrix of Coefficients.
- a conversion sequence can be calculated in Expression (45) below.
- X k forms a time sequence signal shifted by m ⁇ T ⁇ Ts from a reference sequence. Then, for example, when time sequence signals are arranged using a sequence shifted by ⁇ T as X k1 and using a sequence shifted by 2 ⁇ T as X k2 , a correlation value Cor can be obtained from Expression (40) described above.
- Ip ki is a row vector of the internally transmitted signal and Ex ki is an input vector of the externally received signal.
- the signal generation unit 2 , the time sequence data conversion unit 4 , the correlation processing unit 5 , the STO timing detection unit 6 , the first FFT unit 7 , the second FFT unit 8 , the difference calculation unit 9 , and the correction control unit 10 have a configuration in which a memory or a CPU are included and are configured by software by executing a predetermined program.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Discrete Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
Description
- [Non-Patent Document 1] 5GNOW: Non-Orthogonal, Asynchronous Waveforms for Future Mobile Applications, IEEE Communications Magazine, February 2014
- [Non-Patent Document 2] M. Bellanger et al., “FBMC physical layer: a primer”, 2010
- [Non-Patent Document 3] Frank Schaich et al., “Waveform contenders for 5G-suitability for short packet and low latency transmissions”, Vehicular Technology Conference, 2014 IEEE 79th
- [Non-Patent Document 4] Nicola Michailow et al. “Generalized Frequency Division Multiplexing for 5th Generation Cellular Networks”, IEEE Transactions on Communications, Vol. 62, No. 9, 2014
[Math. 1]
X k =A k X k−1 +B k U Expression (1)
[Math. 2]
Y=C k X k +D k V Expression (2)
[Math. 3]
X k+1 =O p(F C)*X k Expression (3)
[Math. 4]
X k =A k X k−1 B k U Expressions (4)
[Math. 5]
Y=C k X k +D k V Expression (5)
[Math. 6]
X k+1 =O p(F C)*X k Expression (6)
[Math. 8]
X k =A k X k−1 +B k U Expression (8)
[Math. 9]
Y=C k X k +D k V Expression (9)
x k(0)=x k−1(0)g(0)
x k(1)=x k−1(0)g(1)+x k−1(1)g(0)
C k(2)=x k−1(0)g(2)+x k−1(1)g(1)+x k−1(2)g(0) [Math. 21]
[Math. 25]
pp i(Z M)g(i)+g(i+M)z −M g+(i+2M)z −2M +g(i+3M)z −M Expression (25)
k=1
k=2
k=3
k=4
X 2 =F C *X 1 =T iFFT*(M M U)
X 3 =T iFFT *X 2 =T iFFT *F C*(M M U)
X 4 =F P *X 3 =*T iFFT F C(M M U)
Y=EX 4
k=1
At Initialization,count(j)=0(j=0,1,2 . . . ,J−1)
f CCDF(m,j)=1/JΣ i=0 jcount(L i),provided that
for any k,j(0≤k≤K−1,0≤j≤J−1)
0 dB≤L j(L j −L j+1=0.01)≤100 dB
{count(L j)=count(L j)+1|satisfied by L j+1≤10 log10 |z −k r k(m)|<L j} [Math. 36]
[Math. 44]
X k+1 =O p(F C)*X k Expressions (44)
-
- 1 synchronization device
- 2 signal generation unit
- 3 signal reception unit
- 4 time sequence data conversion unit
- 5 correlation processing unit
- 6 STO timing detection unit
- 7 first FFT unit
- 8 second FFT unit
- 9 difference calculation unit
- 10 correction control unit
- 11 scenario composing unit
- 12 execution unit
- 13 memory
- 14 mapper input conversion unit
- 15 evaluation unit
- 16 input and output unit
- 17 communication IF
- 18 display unit
Claims (20)
[Math. 1]
X k =A k X k−1 +Bk U Expression (1).
[Math. 2]
Y=C k X k +D k V Expression (2).
[Math. 3]
X k+1 =O p(F c)*X k Expression (3).
[Math. 3]
X k+1 =O p(F C)*X k Expression (3).
[Math. 4]
X k =A k X k−1 +B k U Expression (4)
[Math. 5]
Y=C k X k +D k V Expression (5)
[Math. 6]
X k+1 =O p(F c)*X k Expression (6).
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2017151641 | 2017-08-04 | ||
JP2017-151641 | 2017-08-04 | ||
JP2018094411A JP6612387B2 (en) | 2017-08-04 | 2018-05-16 | Synchronization device and synchronization method |
JP2018-094411 | 2018-05-16 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20190044780A1 US20190044780A1 (en) | 2019-02-07 |
US10355906B2 true US10355906B2 (en) | 2019-07-16 |
Family
ID=65229994
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/052,753 Active US10355906B2 (en) | 2017-08-04 | 2018-08-02 | Synchronization device and synchronization method |
Country Status (2)
Country | Link |
---|---|
US (1) | US10355906B2 (en) |
CN (1) | CN109391580B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20220166653A1 (en) * | 2019-06-07 | 2022-05-26 | Michel Fattouche | A Novel Communication System of High Capacity |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110417699A (en) * | 2019-05-30 | 2019-11-05 | 北京邮电大学 | A method of the ofdm system timing synchronization based on machine learning |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100246698A1 (en) * | 2009-03-26 | 2010-09-30 | Via Telecom, Inc. | Synchronization method and apparatus for orthogonal frequency division multiplexing system |
US8532201B2 (en) * | 2007-12-12 | 2013-09-10 | Qualcomm Incorporated | Methods and apparatus for identifying a preamble sequence and for estimating an integer carrier frequency offset |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU727726B2 (en) * | 1996-10-31 | 2000-12-21 | Discovision Associates | Single chip VLSI implementation of a digital receiver employing orthogonal frequency division multiplexing |
CN103117980B (en) * | 2013-01-31 | 2016-01-13 | 南京正保通信网络技术有限公司 | For the fast digital auto frequency control method of OFDM receiver |
CN104796363A (en) * | 2015-04-24 | 2015-07-22 | 清华大学 | Narrow-band interference estimation method and narrow-band interference estimation device in multi-input and multi-output system |
CN104917599B (en) * | 2015-06-11 | 2018-03-27 | 哈尔滨工业大学 | Transmission method when weighted score Fourier transformation expands in synchronization system |
CN106953826B (en) * | 2017-04-12 | 2020-07-31 | 广西师范大学 | OFDM signal differential receiving method |
-
2018
- 2018-07-26 CN CN201810833873.9A patent/CN109391580B/en active Active
- 2018-08-02 US US16/052,753 patent/US10355906B2/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8532201B2 (en) * | 2007-12-12 | 2013-09-10 | Qualcomm Incorporated | Methods and apparatus for identifying a preamble sequence and for estimating an integer carrier frequency offset |
US20100246698A1 (en) * | 2009-03-26 | 2010-09-30 | Via Telecom, Inc. | Synchronization method and apparatus for orthogonal frequency division multiplexing system |
Non-Patent Citations (5)
Title |
---|
Frank Schaich, et al., "Waveform contenders for 5G-suitability for short packet and low latency transmissions", Vehicular Technology Conference, Alcatel-Lucent AG, Bell Labs, Stuttgart, Germany, 2014. |
Frank Schaich, et al., "Waveform contenders for 5G—suitability for short packet and low latency transmissions", Vehicular Technology Conference, Alcatel-Lucent AG, Bell Labs, Stuttgart, Germany, 2014. |
Gerhard Wunder, et al., "5GNOW: Non-orthogonal, Asynchronous Waveforms for Future Mobile Applications", 5G Wireless Communication Systems: Prospects and Challenges, IEEE Communications Magazine, Feb. 2014, pp. 97-105. |
M. Bellanger, et al., "FBMC Physical Layer: A Primer", PHYDYAS, Jun. 2010, pp. 1-31, (http://www.ict-phydyas.org). |
Nicola Michailow, et al., "Generalized Frequency Division Multiplexing for 5th Generation Cellular Networks", IEEE Transactions on Communications, vol. 62, No. 9, Sep. 2014, pp. 3045-3061. |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20220166653A1 (en) * | 2019-06-07 | 2022-05-26 | Michel Fattouche | A Novel Communication System of High Capacity |
US11451418B2 (en) * | 2019-06-07 | 2022-09-20 | Michel Fattouche | Communication system of high capacity |
Also Published As
Publication number | Publication date |
---|---|
CN109391580B (en) | 2021-06-15 |
US20190044780A1 (en) | 2019-02-07 |
CN109391580A (en) | 2019-02-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4832525B2 (en) | Apparatus and method for transferring data using a plurality of carrier waves | |
US10652072B2 (en) | Systems, devices and methods for communicating data over circularly pulse-shaped waveforms | |
DK2290869T3 (en) | Signaling method and apparatus in a multiple access OFDM system | |
US9680681B2 (en) | Transmission apparatus, reception apparatus, and communication system | |
EP2975790A1 (en) | Transmission device, reception device and communication system | |
WO2016122204A1 (en) | Method and device for controlling power in multi-carrier communication system | |
CN101232472A (en) | Method for detecting OFDM signal channel mixed overlaying pilot frequency and data | |
WO2014153370A4 (en) | Methods and apparatus for tunable noise correction in multi-carrier signals | |
US20170265202A1 (en) | Time domain pilot of single-carrier mimo system and synchronization method thereof | |
US10355906B2 (en) | Synchronization device and synchronization method | |
CN102130864A (en) | Channel estimation method and device | |
US10277448B1 (en) | Method for hierarchical modulation with vector processing | |
CN101835252B (en) | Device and method for channel estimation and channel post-processing | |
JP6612387B2 (en) | Synchronization device and synchronization method | |
JP6377663B2 (en) | Signal generation apparatus, signal generation method, and signal generation program | |
US10798668B2 (en) | Synchronization circuit, synchronization method, signal generating device, signal generating method, and recording medium | |
CN101459640B (en) | OFDM ultra-wideband communication system based on sub-carrier code and communication method thereof | |
JP6684862B2 (en) | Signal generating device, signal generating method, and signal generating program | |
Kalwar et al. | Analysis of carrier frequency offset suppression techniques in SC-FDMA communication system | |
JP2015154154A (en) | Orthogonal modulation/demodulation method and device using complementary golay code | |
CN108353048B (en) | Data transmission method and device | |
WO2023280094A1 (en) | Signal sending and receiving method and apparatus and device | |
CN115225443B (en) | Carrier cyclic shift method and cyclic shift optical filter bank multi-carrier system | |
EP3455963A1 (en) | Systems, devices and methods for communicating data over circularly pulse-shaped waveforms | |
CN107231324A (en) | ICI applied to efficient division multiplexed transmission system compensates method of reseptance |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: ANRITSU CORPORATION, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:RONTE, SUNAO;REEL/FRAME:046537/0525 Effective date: 20180626 |
|
FEPP | Fee payment procedure |
Free format text: ENTITY STATUS SET TO UNDISCOUNTED (ORIGINAL EVENT CODE: BIG.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: NOTICE OF ALLOWANCE MAILED -- APPLICATION RECEIVED IN OFFICE OF PUBLICATIONS |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: PUBLICATIONS -- ISSUE FEE PAYMENT VERIFIED |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
MAFP | Maintenance fee payment |
Free format text: PAYMENT OF MAINTENANCE FEE, 4TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1551); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY Year of fee payment: 4 |